Cant update a graphic added to a library from within XD

Adding graphical elements to a library from within Photoshop or illustrator seems to work fine, however, if I create a graphic in XD and add it to a library, there seems to be no way to edit that library element!  (or at least no obvious way i can see in the same way as .ai and .psd elements).

Would anybody be able to help?

many thanks

Nick